There is some validity to this. Of course, absolutely accurate numbers will never be known, but the Soviet Union lost about 20% of its population and 25% of its resources during WWII.
Mark Harrison states in
Accounting for War that "supply-side shocks to Soviet population, fixed capital, and GNP were never made up post-war in terms of trajectory" (as of 1996 when the book was published).
He goes on further to say that "...the USSR began 1946 with an overall demographic deficit of 35 million...combining war deaths, emigrations, and wartime birth deficits."
As a comparison,
combined Anglo-American civil + military losses were roughly 1 in 250; Soviet losses were 2 in 9 for military personnel, and 1 in 10 for civilians. And the Soviet Union was the only one of the victorious Allies to suffer significant post-war economic stagnation. All other nations (and in particular the US) experienced economic booms and high population growth.
Let's hope not

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